Replacing the Head Gasket on Your Compressor

 

If your compressor leaks or fails to maintain pressure, it might be time to replace the head gasket. The head gasket provides a tight seal between the cylinder head and the valve plate assembly. Over time, this material deteriorates, allowing pressure to escape from the compressor pump. Handling the delicate gasket over multiple service calls also creates wear and tear on its surface.

Safety First!

Before you service your compressor, you must depressurize the tank. Open the drain valve and wait until all of the pressure has been removed. Also, verify that the electrical power has been shut off.

Remove the Old Head Gasket

First, remove the manifold cover by unscrewing the retaining screw. Lift the cover and locate the bolts securing the front and rear of the pump assembly. Detach the bolts so you can move the pump assembly off to the side.

Next, remove the retaining screws that secure the pump’s housing and slide the pump partially out of the housing. Using a pair of pliers, disconnect the front and rear wires, and unplug the ground wire. Once everything is separated, you should be able to pull the entire pump assembly out of the housing.

Using a socket wrench, unscrew the bolts from the assembly so you can separate the pump from the cylinder head. Remove the old gasket and eliminate any residual pieces of gasket material that may be stuck to the cylinder. A smooth surface is required so the new gasket will seal properly.

Put it Back Together

Align the new head gasket with the valve plate assembly. Be sure to seat the gasket against the side of the valve plate that has the exposed valves. Assemble the cylinder head and re-install the head bolts. Follow the manufacturer’s instructions for torque specifications.

Now you can re-connect the pump assembly and slide it into the housing. Once the housing is assembled, secure it onto the tank with the screws, and install the manifold cover. Now you are ready to work under pressure!